Suspension device for lamps



(No Modeli) N. JENKINS. SUSPENSION DEVICE POR LAMPS.

Patented Aug. 17, 1886.

UNITED STATES PATENT EEIOE,

NICHOLAS JENKINS, OE WATEEBURY, ASSIGNOR To HOLMES, BOOTH a HAYDENS, OENEW IIA-VEN, OONNEOTIOUT. Y

SUSPENSION DEVICE FOR LAMPS.

SPECIFICATION formingpart of Letters Patent No. 347,613, dated August17, 1886.-

Application filed April 22, 1886. Serial No. 199,812. (No modelJ To @ZZwhom it may concern.-

Be it known that I, NIcHoLAs JENKINS, a citizen of the United States,residing at Vaterbury, in the county of New Haven and State ofConnecticut, have invented new and useful Improvements in SuspensionDevices for La1nps,'of which the following is a specication.

This invention consists in an improved con- Io struction and combinationof devices for suspendingala-mp from the ceiling of a room and adjustingit at any vdesired height.

In the annexed drawings,'Figure 1 is a top view of my improved lampsuspension devices. Fig. 2 is an elevation of the same with casingpartly removed., Fig. 3 isa horizontal section of the suspension devicesviewed from the under side.

The numeral 1 designates a casing,-which 2O may be struck up orotherwise made from sheet metal or other material, and suitablyornamented. In this casing is a central vertical arbor, 2, the upper endol"v which is reduced in diameter, and carries a loop, 3, by

which the casing and its contents are to be suspended from a hooksecured to the ceiling or other support.

On the lower part of the lixed arbor 2 is mounted-a rotary drum, 4,which incloses a 3o coiledspring, 5, that surrounds said arbor, one end0f the spring being secured to the arbor and the other end to theinterior of the drum. The outer side of the drum is cogged or providedwith aspur-gear,.6, through which 3 5 the drum isrotated, as hereinafterexplained.

Secured to the arbor 2 above the drum 4 is a plate, 7, of approximatelyrectangular form. Two diagonally-opposite corners of this plate areformed with arms 8, each of which affords 4o a bearing for the Verticalshaft or journal of a horizontal sheave, 9. These sheaves 9 are arrangedimmediately abovethe armsS, and

secured to the sheave-journals beneath said arms are pinions 10, whichmesh with the gear 4 5 6 on the central drum. Each sheave 9 is deeplyflanged to receive and support the lamp.

suspension-chains 12, the upper ends of which are secured to Said`sheaves. These chains 12 pass from the horizontal sheaves 9 oververtical guide-pulleys 13, adjacent to said sheaves, and thence extenddown through openings 14 in the lower part of the casing. Theguidepulleys 13 are journaled at diagonally-opposite corners of theplate 7 on arbors 15, projecting from said plate. 1

The lamp or other object to be suspended is connected with the chains 12in any suitable or well-known manner. By drawing the lamp er otherobject down, the chains 12, in paying out from the sheaves 9, willrotate the 6oy same, together with their pinions 10, thereby rotatingthe drum 4 in such direction as to coil up or wind its inclosed spring.On moving the lamp or other suspended object up ward the tension of thecoiled spring 5 will 65 rotate the drum 4and sheaves 9 in such directionas to wind the chains 12 on said sheaves.

In order to limit the upward movement of the suspension-chains 12, theymay be provided beneath the casing 1 with stops 16, of such 7o 'form andsize as to preclude their vpassage through the openings 14 inl thebottom of said casing.

It will be seen that by providing a spring, 5, of proper tensile power alamp or other object ofy ordinary weight can be suspended and adjustedat will to any required altitude Without the intervention of specialweights or locking devices.

Heretofore in lamp suspension devices of this general character thesuspension chains or cords have been wound either upon vertical sheavesor else directly upon the springinclosing drum, and in the former casesaid drum has been geared by intermediate pin- `ions with crown-gears onthe vertical Windingsheaves, or it has sometimes been provided with amiter-gear meshing with a miter-pinion connected with said verticalsheave. VSo far as I am aware, the arrangement of a spring- 9o inelosingdrum having aAspur-gear meshing with horizontal pinions connected withhorizontal sheaves i'or winding and supporting the lampsuspension-chains, as herein shown and described, has not hitherto beenused or known. This construction is simple, convenient, and effective,distributes the weight of the suspendedlarnp more equally, and enablesit to be adj usted and balanced with great accuracy at any desiredelevation.

What I claim as my invention is- 1. In a lamp suspension device, thecombi- ICG nat-ion ol' suspension chains, vertical guidepulleystherefor, a central arbor, a spring-inelosing druni havinga spur-gearand mounted on said arbor, a plate, 7, horizontal sheaves journaled tothe plate and geared With said drum and carrying the suspension-chains,sub' stantially as described.

2. In a lamp suspension device, the combination of a central arbor, aspringinelosing drum mounted thereon and having a spurgear, a plate, 7,horizontal sheaves provided with shafts supported by said plate, andhaving pinions engaging the spur-gear of the drum, verticalguidepulleys, land suspensionchains passing over said pulleys andsecured to the horizontal sheaves, substantially as described.

3. The combination of suspension-chains having stops, a casingprovidodwith openings for the passage of the stops, an arbor, a springiuclosiugdrum mounted on the arbor and having a spur-gear, a plate, 7, audhorizontal sheaves supported by the plate, and having pinious engagingthe spur-gear, substantially 5 as described.

l. fln a lamp suspension device, the combination of acasinghavingopenings in its lower part and provided with a central Ixed arbor, arotary drum mounted on said arbor and provided with a spur-gear, aeoiledspringinclosed in said drum, a plate, 7, horizontal sheaves supported bythe plate and having pinions meshing with the drum-gear, verticalguide-pulleys, and suspension chains passed through the easing over thepulleys and secured to the sheaves, substantially as described.

5. In a lamp suspension device, the combination of the casing 1, havingopenings 111 and central arbor, 2,v the drum l, having spurgear 6, thespring 5, inelosed in said drum, the plate 7, having arms 8 and arbors15, the horizontal sheaves 9, provided with pinions 10, theguide-pulleys 13, and the suspensionchains 12, having stops 1G,substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

NICHOLAS JENKINS.

\Vitnesses:

Guo. H. BENHAM, TuoMAs I. VALKER.

